When my tcase failed I rapped my 03 evo out and threw p0138 p0141 and po300 cels and if I drive for a few days without clearing the codes the car develops a misfire under light throttle but if I let out and get back in it it goes away. If I reset my ecu by unhooking the battery the codes are gone for about a day but come back along with the missfire and my cars been tuned and the rear o2 sensor has been turned off and the p0138 and p0141 codes are both for the rear o2 so if anyone has any idea what it could be I appreciate your input.